<html>
<head>
    <meta charset="utf-8">
    <title>网站首页</title>
</head>
<body>
    <div>
        <?php echo $header; ?>
    </div>
    <div>
        网站内容
    </div>
    <div>
        <?php echo $bottom;?>
    </div>
</body>
</html>